American ring sizes and international comparison table
Ring sizes differ around the world, so the information in US, German or international standards is not always the same. Who wants a Have a ring made or design your own, you should know the differences in order to choose the right size. In this article, you will learn how German sizes work, how they differ from other international and American ring sizes and how to find your perfect fit.
Understanding ring sizes worldwide
The international ring size indicates how large the inner diameter or inner circumference of a ring is and therefore how well the ring fits on the finger. The units of measurement and designations differ from country to country. This makes it necessary to know the systems, especially if a ring is to be customised, compared or made internationally. Below you can find out how ring sizes are defined in Germany, the USA, China, Japan and many other countries.
American ring sizes
In the USA and Canada, sizes are specified with numerical values. Each value corresponds to a defined inner circumference, with half sizes allowing a finer gradation. For example, the US ring size 6 corresponds to an inner circumference of approximately 51.5 mm. This system is often used for international orders or in the jewellery trade outside Europe.
The numbers usually range from very small sizes to large values for wide or eye-catching rings. Precision is particularly important, as small differences between sizes can be clearly noticeable. Whoever orders a Have a wedding ring made If you only know the American ring size, you should convert the values precisely to ensure a perfect fit. We will be happy to help you with this in our consultation. You are welcome to order a Book an appointment.
Ring sizes in Germany and Europe
In Germany and Austria, the ring size is determined by the inner circumference in millimetres. For example, size 50 corresponds to a circumference of 50 mm. Switzerland also uses the inner circumference as a basis, but has its own values for the sizes, for example 10, 12 or 14.
France also uses metric measurements, although the gradations differ slightly from those in Germany. Italy uses its own numerical system, which also differs from the Central European standards. Great Britain, on the other hand, uses letter codes that differ significantly from the metric measurements.
Ring sizes in Australia
In Australia, sizes are given with letter codes similar to those in the UK and differ in their categorisation. For example, an Australian size may correspond to a different inner circumference than the same letter in the UK. The Australian system is mainly used for locally manufactured rings and jewellery.
Ring sizes in China and Japan
China and Japan use their own numerical systems, which are also based on the inner circumference, but differ from European and American scales. In Japan, the inner diameter is often also checked in order to determine the fit more precisely.
The differences between the systems can mean that a conversion is necessary for an international order or production. Especially for rings with special designs or individual measurements, it is important to determine the exact size so that the ring fits comfortably and looks its best.
If you are unsure which size is right for you, use our table and tips to measure your ring size.
Ring size: international table
To make sure you are on the safe side when designing your personalised ring, you will find a clear international conversion table here. It will help you to determine your exact size and compare it with international ring sizes.
You can see the ring sizes in the following table:
Germany, England, France, USA/Canada, China, Italy, Australia and Switzerland - each in relation to the inner diameter in millimetres.
| INTERNATIONAL RING SIZE TABLE | ||||||||
|---|---|---|---|---|---|---|---|---|
| Inner diameter (in mm) |
Germany | England | France | USA/Canada | China | Italy | Australia | Switzerland |
| 12,7 | 40 | C | 0,0 | 1,4 (1) | 1 | 41 | D | 0 |
| 13,0 | 41 | C 1/2 | 1,0 | 1,8 (1-) | 2 | 42 | D½ | 1 |
| 13,4 | 42 | D 1/2 | 2,0 | 2,2 (2) | 3 | 43 | E | 2 |
| 13,7 | 43 | E 1/2 | 3,0 | 2,6 (2-) | 4 | 44 | E½ | 3 |
| 14,0 | 44 | F | 4,0 | 3,0 (2-) | 5 | 45 | F | 4 |
| 14,3 | 45 | G | 5,0 | 3,4 (3) | 6 | 46 | G | 5 |
| 14,6 | 46 | G 1/2 | 6,0 | 3,7 (3-) | 7 | 47 | G½ | 6 |
| 15,0 | 47 | H 1/2 | 7,0 | 4,1 (4) | 8 | 48 | H | 7 |
| 15,3 | 48 | I 1/2 | 8,0 | 4,5 (4-) | 9 | 49 | I | 8 |
| 15,6 | 49 | J | 9,0 | 4,9 (4) | 10 | 50 | J | 9 |
| 15,9 | 50 | K | 10,0 | 5,3 (5) | 11 | 51 | K | 10 |
| 16,2 | 51 | K 1/2 | 11,0 | 5,7 (5-) | 12 | 52 | K½ | 11 |
| 16,6 | 52 | L 1/2 | 12,0 | 6,1 (6) | 13 | 53 | L | 12 |
| 16,9 | 53 | M 1/2 | 13,0 | 6,4 (6) | 14 | 54 | M | 13 |
| 17,2 | 54 | N | 14,0 | 6,8 (6-) | 15 | 55 | N | 14 |
| 17,5 | 55 | O | 15,0 | 7,2 (7) | 16 | 56 | O | 15 |
| 17,8 | 56 | P | 16,0 | 7,6 (7-) | 17 | 57 | P | 16 |
| 18,1 | 57 | P 1/2 | 17,0 | 8,0 (8) | 18 | 58 | P½ | 17 |
| 18,5 | 58 | Q 1/2 | 18,0 | 8,4 (8) | 19 | 59 | Q | 18 |
| 18,8 | 59 | R | 19,0 | 8,7 (8-) | 20 | 60 | R | 19 |
| 19,1 | 60 | S | 20,0 | 9,1 (9) | 21 | 61 | S | 20 |
| 19,4 | 61 | T | 21,0 | 9,5 (9-) | 22 | 62 | T | 21 |
| 19,7 | 62 | T 1/2 | 22,0 | 9,9 (9-) | 23 | 63 | T½ | 22 |
| 20,1 | 63 | U 1/2 | 23,0 | 10,3 (10) | 24 | 64 | U | 23 |
| 20,4 | 64 | V | 24,0 | 10,7 (10-) | 25 | 65 | V | 24 |
| 20,7 | 65 | W | 25,0 | 11,0 (11) | 26 | 66 | W | 25 |
| 21,0 | 66 | X | 26,0 | 11,4 (11) | 27 | 67 | X | 26 |
| 21,3 | 67 | X 1/2 | 27,0 | 11,8 (11-) | 28 | 68 | X½ | 27 |
| 21,6 | 68 | Y 1/2 | 28,0 | 12,1 (12) | 29 | 69 | Y | 28 |
| 22,0 | 69 | Z 1/2 | 29,0 | 12,6 (12-) | 30 | 70 | Z | 29 |
| 22,3 | 70 | Z +1 | 30,0 | 13,0 (12-) | 31 | 71 | Z+ | 30 |
How to find the right size for your ring
The right international ring size is crucial to ensure that your piece of jewellery fits comfortably and looks good. There are various ways to determine it:
- With a ring measuring tape: Measure directly on the finger, preferably in the evening at room temperature, as fingers can change slightly during the course of the day.
- With an existing ring: Read off the inside diameter with a ruler or calliper gauge and compare with a size chart.
- On site at our goldsmiths: We determine the right size professionally and advise you at the same time if you want your Forge your own ring you want. This ensures that your individually designed piece of jewellery fits perfectly.
- With our ring sizer: request it below and we will send it to you free of charge by post so that you can determine your international ring size conveniently and precisely.
- On the basis of photos: If it is to be a gift, please bring photos of the hands. We can use these to give you the best possible advice on whether the ring will fit.
Our tip: Use the ring size calculator or visit our RINGSCHMIEDE BERLIN, for example, in order to Forge your own wedding ring or from us a suitable Have a signet ring made. Not only will your ring be a perfect fit, but making it will also be a special experience.
You can also use the Ring cost calculator to plan your budget for materials, engraving or gemstones. Also a Forging your own engagement ring is of course possible with us. We will be happy to advise you on style, design and material.
FAQ: Understanding international ring sizes
Here you will find the most important questions about international ring sizes, conversions and making or designing your own ring at a glance.
What are American ring sizes and how do they differ from German sizes?
American ring sizes (US ring sizes) are based on numerical values and differ significantly from the metric ring sizes in Germany. While in Germany the ring size corresponds to the inner circumference in millimetres, US sizes specify numerical values, e.g. US size 6 ≈ 51.5 mm inner circumference.
How does the international ring size chart help me?
The table shows all common ring sizes - from Germany and the USA to China, Japan and Australia - compared to the inner diameter in millimetres. This allows you to determine your exact size and make the right choice for customised rings.
What if you want the ring to be a surprise?
For example, if you secretly use a Have an engagement ring made you can read off the inside diameter of an existing ring and compare it with the international table. Alternatively, we can help you determine the right size safely and secretly on site, using photos or our ring sizer.